Hot sprue valve assembly for an injection molding machine

Details Hot sprue valve assembly for an injection molding machine Hot sprue valve assembly for an injection molding machine

1981-08-27

1983-09-20

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

B29D 1700

Patent

active

044055404

ABSTRACT:
A hot sprue valve assembly is provided for controlling flow of molten material through a hot sprue bushing of an injection molding machine. The valve assembly is particularly designed for use with an injection molding machine for molding centrally apertured record discs, such as video information discs. The valve assembly includes a poppet valve movable between an open position to allow flow of molten disc-forming material into a mold cavity, and a closed position to prevent flow of the disc-forming material into the mold cavity. The poppet valve is designed to mold a central aperture in the disc upon movement to the closed position, and the valve assembly is designed to accommodate air ejector apparatus for removing a solidified record disc from the machine.

REFERENCES:
patent: 3010156 (1961-11-01), Smith
patent: 3937779 (1976-02-01), Simmons
patent: 3989436 (1976-11-01), McNeely
patent: 4171941 (1979-10-01), Yotsutsuji
patent: 4260360 (1981-04-01), Holmes

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